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The SPDR S&P MIDCAP 400 ETF (MDY) is seeing unusually high volume in afternoon trading Tuesday, with over 4.1 million shares traded versus three month average volume of about 1.5 million. Shares of MDY were up about 1.2% on the day.

Components of that ETF with the highest volume on Tuesday were SunEdison (SUNE), trading up about 3.1% with over 11.7 million shares changing hands so far this session, and Advanced Micro Devices (AMD), up about 1.4% on volume of over 11.2 million shares. Micros Systems (MCRS) is the component faring the best Tuesday, higher by about 17.6% on the day, while Greenhill & Co. (GHL) is lagging other components of the SPDR S&P MIDCAP 400 ETF, trading lower by about 3.2%.